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Those attacks were claimed by Lashkar-e-Jhangvi, a Sunni militant group known for its virulent hatred of Shiite Muslims.
NPR: Pakistani Shiites Mourn As Bomb Death Toll Hits 45
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Lashkar-e-Jhangvi is a radical Sunni Muslim militant group that has carried out many attacks in Pakistan, especially against minority Shiite Muslims.
WSJ: 3 Die in Attack at Peshawar Court
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Sunni militant group Laskhar-e-Jhangvi said it had carried out the bombing, which hit a largely Hazara area of Quetta.
BBC: Angry Hazaras protest in Quetta, 17 Feb
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The banned Sunni militant group Lashkar-e-Jhangvi said it carried out the attack, as well as the one in January.
BBC: Pakistan blast: Governor fury at 'intelligence failure'
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The bombed area is predominantly Shia Muslim, and the Sunni extremist group Lashkar-e-Jhangvi said it had carried out the attack.
BBC: Pakistan blasts: Scores killed at Quetta snooker hall
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The tapes were said to be mostly of sermons by clerics linked to the banned Lashkar-e-Jhangvi (LJ) group, a Sunni extremist organisation close to the Taliban and heavily involved in sectarian killings in Pakistan.
BBC: Deadly blast in Pakistani village
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Police in Pakistan say they have detained 250 members of the hardline Sunni Muslim group, Sipah-e-Sahaba.
BBC: Pakistan detains hardline Sunnis
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Pakistan's intelligence agencies helped nurture Sunni militant groups like Lashkar-e-Jhangvi in the 1980s and 1990s to counter a perceived threat from neighboring Iran, which is mostly Shiite.
NPR: Pakistani Shiites Mourn As Bomb Death Toll Hits 45
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The third suspect is one of the Sunni extremist organisations such as Lashkar-e-Jhangvi, with affiliation to the Afghan and Pakistani Taliban.
BBC: Karachi bomb was 'caused by IED'
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Beth's husband, Private E-2 Luigi Pratt, drove Army trucks on convoys through Iraq's Sunni Triangle.
NPR: Waiting and Dreading: Families in War Time
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The 36-million-strong community is a bulwark against the violent Sunni fundamentalism of groups such as the Taliban, Lashkar-e-Jhangvi and Punjab-based Sipah-e-Sahaba.
WSJ: Sadanand Dhume: The Plight of Pakistan's Shia
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They note that he recently ordered the release from prison of Maulana Azam Tariq, the spiritual leader of Sipah-e-Sahaba (Soldiers of the Companions of the Prophet), a radical Sunni group thought to be behind many of the anti-Shia attacks.
ECONOMIST: Pakistan